A subnet calculator, a binary converter and the CCNA port table. Use them while you study, on your phone or your computer.
Enter an IP address and its prefix. We work out everything they will ask you in the exam.
The conversion you practice most for subnetting. Type in either field.
Value of each bit in an octet: 128 · 64 · 32 · 16 · 8 · 4 · 2 · 1
The ones that really come up in the exam. Search by number, protocol or what it does.
| Port | Protocol | Transport | What it does |
|---|
Want to drill them with exam-style questions? They are in World 8 of the app.
The app has these tools and a lot more: theory, CLI exercises, troubleshooting and mock exams.
📲 Download RoutingLab